Re: POC: GROUP BY optimization

Michael Paquier <michael@paquier.xyz>

From: Michael Paquier <michael@paquier.xyz>

To: Tomas Vondra <tomas.vondra@enterprisedb.com>

Cc: David Rowley <dgrowleyml@gmail.com>, Zhihong Yu <zyu@yugabyte.com>, "Andrey V. Lepikhov" <a.lepikhov@postgrespro.ru>, Teodor Sigaev <teodor@sigaev.ru>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, PostgreSQL Developers <pgsql-hackers@lists.postgresql.org>

Date: 2022-08-02T10:21:13Z

Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Restore preprocess_groupclause()
- 505c008ca37c 17.0 landed
Rename PathKeyInfo to GroupByOrdering
- 0c1af2c35c7b 17.0 landed
Add invariants check to get_useful_group_keys_orderings()
- 91143c03d4ca 17.0 landed
Fix asymmetry in setting EquivalenceClass.ec_sortref
- 199012a3d844 17.0 landed
Multiple revisions to the GROUP BY reordering tests
- 874d817baa16 17.0 landed
Get rid of pg_class usage in SJE regression tests
- e1b7fde418f2 17.0 landed
Rename index "abc" in aggregates.sql
- b91f91870828 17.0 landed
Explore alternative orderings of group-by pathkeys during optimization.
- 0452b461bc40 17.0 landed
Generalize the common code of adding sort before processing of grouping
- 7ab80ac1caf9 17.0 landed
Fix out-dated comment in preprocess_groupclause()
- f6c70b81802a 15.0 landed
- 78a9af1a2764 16.0 landed
Force parallelism in partition_aggregate
- 2fe6b2a806f2 16.0 landed
- 01474f56981a 15.0 landed
Optimize order of GROUP BY keys
- db0d67db2401 15.0 landed

On Fri, Jul 15, 2022 at 09:46:51PM +0200, Tomas Vondra wrote:
> I agree this is a mistake in db0d67db2 that makes the test useless.

Tomas, please note that this is an open item assigned to you.  Are you
planning to do something with these regression tests by beta3?
--
Michael